\section{Related Work}
Background\ldots
\cite{Gan_MM_2013}

%\begin{figure}[!t]
\begin{figure}
  \begin{minipage}{1.0\columnwidth}
		\centering
			\begin{minipage}{0.5\columnwidth}	
				\centerline{\includegraphics[width=1.0\linewidth]{demo3}}             
			\end{minipage} 
		\hfill
	\end{minipage}
  \vspace{-2ex}
  \caption
    {
    	\small
    	Flowchat of the multi-Kinect multiple people tracking.
    }
  \label{fig:multiple_kinect_tracking}
\end{figure}